Start with the sauce; chop and mince the jalapeño pepper, then add it, along with a tablespoon of minced garlic and the tomato purée, to a sauce pan and heat stirring the entire way through. Feel free to add other spices such as onion powder, garlic powder, pepper and salt, to taste.
Next, preheat your oven to 375 degrees and begin to spread your pizza dough. Then put the sauce over about half of it, leaving about 1/2 inch perimeter. Add your ingredients to only that half, then add more sauce to the whole bit of the dough, save for the edges.

Fold the dough only half over, making sure to squish the edges together so they cannot desperate during the baking.
Take your egg white and glaze the top of your calzone, and cut 3-5 1inch slits for ventilation.

Bake for 20-30 minutes, until golden on top. Take out and let cool, then dig in!